US 8,075,218 B2Granted

Prestressed shaft and hub connection having a perfect cone shape

AssigneeNeapco Europe GmbH

InventorThilo Kroener

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Abstract

The invention relates to a shaft and hub connection (20) for transmitting torque, a common longitudinal axis (X-X) comprising the following components: a shaft (22) which rotates about the longitudinal axis (X-X) and comprises an entraining longitudinal section having an untrue outer contour (26), and a hub (24) that is coaxial to the shaft (22) and encloses the shaft (22) with its internal contour (28) at least in the area of the entraining longitudinal section. The invention is characterized in that the outer contour (26) of the entraining longitudinal section of the shaft (22) and the inner contour (28) of the hub (24) have the shape of a perfect cone to such a degree that, when the shaft (22) and the hub (24) are assembled, they automatically self-lock, thereby holding the shaft and hub connection (20) together. The connection also comprises connecting means which prestress the shaft (22) and the hub (24), when assembled, in the direction of the longitudinal axis (X-X).

Claims10

Dependent claims

A shaft/hub connection (20) for transmitting torque, comprising the following components having a common longitudinal axis (X-X):

a shaft (22), which can be rotated about the longitudinal axis (X-X), the shaft comprising an entraining longitudinal section having a polygonal or trochoidal outer contour (26);
a hub (24), which is coaxial to the shaft (22) and which encloses the shaft (22) with a longitudinally extending end recess having a corresponding polygonal or trochoidal inner contour (28) at least in the area of the entraining longitudinal section;
and
a connecting means that prestresses the shaft (22) and the hub (24) when in a joined state, towards the longitudinal axis (X-X);
wherein the outer contour (26) of the entraining longitudinal section of the shaft (22) and the inner contour (28) of the hub (24) have the shape of a perfect cone to such an extent that, when the shaft (22) and the hub (24) are joined, the shaft and the hub automatically frictionally self-lock, thereby holding the shaft/hub connection (20) together;
wherein the connecting means is formed by a prestressing ring (34), which encompasses ramps (30), which are respectively disposed on an outer side of the shaft (22) adjacent the entraining longitudinal section and on an outer side of the hub (24) adjacent the recess, and which revolves around the longitudinal axis (X-X) and thus holds the shaft/hub connection (20) under prestress;
wherein the prestressing ring (34) has a circumferential sidewall (38) and a plurality of circumferentially spaced side wall sections (40) that clampingly engage the ramps and deform elastically at the ramps (30) of the outer side of the shaft (22) and the outer side of the hub (24) when the prestressing ring is secured to the shaft and hub;
and
wherein the axial length of the entraining longitudinal section is up to 40% of the average cone diameter of the cross section of the polygonal or trochoidal entraining longitudinal section.

6 more elements

A shaft/hub connection (20) for transmitting torque and defining a common longitudinal axis (X-X), the shaft/hub connection comprising:

a shaft (22) which can be rotated about the longitudinal axis (X-X) of the shaft/hub connection, the shaft comprising an entraining longitudinal section having a polygonal or trochoidal outer contour (26), the shaft defining a ramp (30) disposed along an outer side of the shaft adjacent the entraining longitudinal section, the ramp extending around the longitudinal axis (X-X);
a hub (24) positioned coaxial to the shaft (22) and having a longitudinally extending end recess having a corresponding polygonal or trochoidal inner contour (28) that encloses at least a portion of the entraining longitudinal section of the shaft, the hub defining a ramp (30) disposed along an outer side of the hub adjacent the recess and extending around the longitudinal axis;
and
a prestressing ring (34) having side walls (38), the ring surrounding the ramps of the shaft and hub, and applying a prestressing force against the shaft (22) and the hub (24) when connected, the prestressing ring (34) having a circumferential sidewall (38) and a plurality of circumferentially spaced side wall sections (40) that clampingly engage the ramps and deform elastically at the ramps (30) of the outer side of the shaft (22) and the outer side of the hub (24) when the prestressing ring is secured to the shaft and hub;
wherein the polygonal or trochoidal outer contour (26) of the entraining longitudinal section of the shaft (22) and the inner contour (28) of the hub (24) have the shape of a perfect cone such that the shaft (22) and the hub (24) automatically frictionally self-lock when joined, thereby holding the shaft/hub connection (20) together;
and
wherein the axial length of the entraining longitudinal section of the shaft is up to 40% of the average cone diameter of a cross section of the polygonal or trochoidal entraining longitudinal section of the shaft.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/994,876Filed 6 Jul 2006
Priority: DE 10 2005 031 8326 Jul 2005
Published: US 2009/0010708 A18 Jan 2009
Granted: 13 Dec 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

F16D 1/092
With radial clamping due to axial loading of at least one pair of conical surfaces: the pair of conical mating surfaces being provided on the…
F16B 2200/509
Flanged connections: clamped
F16D 3/2055
The pins extending radially outwardly from the coupling part: having three pins, i.e. true tripod joints
F16D 2001/102
Quick-acting couplings in which the parts are connected by simply bringing them together axially: the torque is transmitted via polygon shaped…